A friend of yours is loudly singing a single note at 417 Hz while racing toward you at 25.7 m/s on a day when the speed of sound is 344 m/s. What

A friend of yours is loudly singing a single note at 417 Hz while racing toward you at 25.7 m/s on a day when the speed of sound is 344 m/s. What frequency do you hear?( in HZ)? What frequency does your friend hear if you suddenly start singing at 417 Hz?